Selective Pixel Output for Artificial Reality Displays
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Solution Overview
Problem
Existing artificial reality systems face challenges in transmitting high-resolution display data at high update rates due to limited data bus bandwidth, often relying on data compression which leads to information loss and suboptimal display quality.
Innovation Solution
The system organizes pixels into valid and invalid tiles based on displaying content, transmitting only valid tiles' data while skipping invalid tiles, along with tile-validity metadata to downstream devices, allowing for uncompressed data transmission and reducing bandwidth requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data compression is used to transmit display data through limited bandwidth, then bandwidth efficiency is improved, but information loss occurs and display quality deteriorates
Solution Approach 1:
The patent extracts and transmits only the essential information (valid tile identifiers and their pixel data) while omitting redundant information (invalid tile data). By identifying and transmitting only valid tiles that contain actual display content, the system achieves efficient bandwidth utilization without data compression, thereby preventing information loss and maintaining high display quality.
Solution Approach 2:
Instead of transmitting complete frame data, the patent transmits only the necessary portion (valid tiles) of the display data. This partial transmission approach sends exactly what is needed for rendering the current frame without the excess of transmitting entire frames or using compression algorithms, optimizing bandwidth usage while preserving complete display information.
2Productivity
If all pixels are transmitted at high update rates, then display quality is maintained, but bandwidth requirements exceed available capacity
Solution Approach 1:
The patent segments the display frame into multiple tiles and identifies which tiles are valid (contain display content) and which are invalid (black background). By processing and transmitting only valid tiles individually, the system dramatically reduces the total data volume that needs to be transmitted at high update rates, enabling high refresh rates within available bandwidth constraints.
Solution Approach 2:
The patent transmits only the partial set of pixels contained in valid tiles rather than all pixels in the entire frame. This selective transmission approach maintains the necessary pixel update rate for high-quality display while reducing the total data transmission volume to fit within available bandwidth capacity.
3Loss of information
If uncompressed display data is transmitted, then display quality is preserved, but bandwidth consumption increases beyond available capacity
Solution Approach 1:
The patent extracts only the valid tile identifiers and their corresponding pixel data from the complete frame, excluding invalid tiles entirely. This extraction approach transmits uncompressed data for valid tiles (preserving information integrity) while reducing the total data volume to match available bandwidth capacity by omitting redundant invalid tile data.
Data Source
AI summary
In one embodiment, a computing system may write a first set of pixel values in a tile order into a first buffer with the pixel values organized into a first set of tiles. The system may generate first validity data for the first set of tiles. The first validity data may include a validity indicator for each tile to indicate if that tile is a valid tile. The system may read from the first buffer a first subset of pixel values in a pixel row order corresponding to pixel rows of the first set of tiles based on the valid data. The first subset of pixel values may be associated with valid tiles of the first set of tiles. The system may send the first subset of pixel values and the first validity data of the first set of tiles to a display via an output data bus.